Some module on my site is causing problems with redirection ... this is seen most glaringly with logintoboggan (#942600: Redirection after registration is failing) but I see the same behaviour with Views Bulk Operations and I've seen it with some inline-editing buttons like those that can be shown on panel pages. Almost always the same behaviour, a "?XXX=1" where "XXX" is some random number, is appended to the destination URL. I've no notion what is causing the problem nor even any idea of how to find the culprit code.
So, I'm reaching out to developers in the hope that somebody has seen this before and can tell me if not what module is causing the problem at least what to look for within the code base.
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i do so hate people who don't follow up
even on their own posting, some body somewhere will search for this and want to know. I have located the offending module to be the ajax_ui and submitted a bug report #942912: ajax_ui creating redirection failures --- note that this effects VBO, Panels, and other modules that attempt to use the destination URL to redirect a user after posting a page.
I hope this note saves somebody some time, this was tough to find.